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From "Gilles (JIRA)" <>
Subject [jira] [Created] (MATH-1206) Cost in least-squares fitting
Date Thu, 26 Feb 2015 13:56:04 GMT
Gilles created MATH-1206:

             Summary: Cost in least-squares fitting
                 Key: MATH-1206
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.4.1, 3.4, 3.3
            Reporter: Gilles
            Assignee: Gilles
             Fix For: 4.0

In {{org.apache.commons.math4.fitting.leastsquares.AbstractEvaluation}}, the value returned
by the "getCost" method is not consistent with the definition of "cost" in a least-squares
problem: It is the sum of the squares of the residuals, but the method returns the square-root
of that quantity.

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